Centos-yum问题解决Existing lock /var/run/yum.pid: another copy is running as pid:3355.Another app is currently holding the yum lock; waiting for it to exit... The other application is: yum-updatesd-he主要原因就是yum在自动更新,只要关掉他就可以了解决方案：直接输入 rm -f /var/run/yum.pid或者： /etc/init.d/yum-updatesd stop也可以等更新完了再进行安装yum.
